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Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Activity in Allowance for Loan Losses Broken out by Portfolio Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance $ 274,294 $ 243,130 $ 255,024 $ 225,366
Charge-offs (15,428) (25,081) (26,015) (39,111)
Recoveries 1,926 2,535 3,714 4,327
Provision for (Reduction of) Loan Losses 27,656 15,185 54,652 44,864
Foreign Currency Translation Adjustments (1,739) 727 (666) 1,050
Ending Balance 286,709 236,496 286,709 236,496
Allowance for Unfunded Credit Commitments [Roll Forward]        
Beginning balance 52,823 46,335 51,770 45,265
Provision for unfunded credit commitments 1,424 621 2,400 1,676
Foreign currency translation adjustments (143) 44 (66) 59
Ending balance 54,104 47,000 54,104 47,000
Commercial loans | Software/internet        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 103,295 109,502 96,104 97,388
Charge-offs (13,402) (19,401) (20,073) (27,381)
Recoveries 404 1,236 977 2,407
Provision for (Reduction of) Loan Losses 13,179 1,527 25,980 20,246
Foreign Currency Translation Adjustments (828) 73 (340) 277
Ending Balance 102,648 92,937 102,648 92,937
Commercial loans | Hardware        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 28,472 23,284 27,614 31,166
Charge-offs (461) (249) (3,414) (4,273)
Recoveries 643 77 1,231 344
Provision for (Reduction of) Loan Losses 6,447 4,474 9,551 394
Foreign Currency Translation Adjustments (406) 214 (287) 169
Ending Balance 34,695 27,800 34,695 27,800
Commercial loans | Private equity/venture capital        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 91,618 57,078 82,468 50,299
Charge-offs (112) 0 (112) 0
Recoveries 0 0 10 0
Provision for (Reduction of) Loan Losses (2,237) 9,263 6,568 15,969
Foreign Currency Translation Adjustments 140 444 475 517
Ending Balance 89,409 66,785 89,409 66,785
Commercial loans | Life science/healthcare        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 25,806 31,542 24,924 25,446
Charge-offs 0 (4,678) (864) (6,410)
Recoveries 3 8 56 44
Provision for (Reduction of) Loan Losses 9,876 819 11,507 8,527
Foreign Currency Translation Adjustments (621) 39 (559) 123
Ending Balance 35,064 27,730 35,064 27,730
Commercial loans | Premium wine        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 3,365 4,343 3,532 4,115
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Reduction of) Loan Losses 78 (1,155) (83) (929)
Foreign Currency Translation Adjustments (5) (55) (11) (53)
Ending Balance 3,438 3,133 3,438 3,133
Commercial loans | Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 3,482 4,377 3,941 4,768
Charge-offs (1,164) (753) (1,263) (1,047)
Recoveries 566 180 1,103 477
Provision for (Reduction of) Loan Losses 13 316 (893) (74)
Foreign Currency Translation Adjustments (1) 15 8 11
Ending Balance 2,896 4,135 2,896 4,135
Commercial loans | Commercial loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 256,038 230,126 238,583 213,182
Charge-offs (15,139) (25,081) (25,726) (39,111)
Recoveries 1,616 1,501 3,377 3,272
Provision for (Reduction of) Loan Losses 27,356 15,244 52,630 44,133
Foreign Currency Translation Adjustments (1,721) 730 (714) 1,044
Ending Balance 268,150 222,520 268,150 222,520
Consumer loans | Consumer loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 18,256 13,004 16,441 12,184
Charge-offs (289) 0 (289) 0
Recoveries 310 1,034 337 1,055
Provision for (Reduction of) Loan Losses 300 (59) 2,022 731
Foreign Currency Translation Adjustments (18) (3) 48 6
Ending Balance $ 18,559 $ 13,976 $ 18,559 $ 13,976